4GB DDR3 RAM is neither forward nor backward compatible with any earlier type of random-access memory (RAM) because of different signaling voltages, timings, and other factors. DDR3 is a DRAM interface specification. ... Thus with a memory clock frequency of 100 MHz, DDR3

Built with a durable anti-shock rubber case, the military green 1TB USB 3.0 External Hard Drive from Transcend combines a 1TB storage capacity with a USB 3.0 interface, 256-bit AES file encryption, and military-grade shock resistance. The internal 2.5″ hard drive receives further protection from a suspension system, while a one-touch auto-backup button helps to create a second copy of your data and a quick reconnect button re-enables the removed hard drive without needing to remove and reinsert...